[jira] [Closed] (CALCITE-4977) Support Snapshot in RelMdColumnOrigins

["Liya Fan (Jira)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CALCITE-4977?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Liya Fan closed CALCITE-4977.
-----------------------------

Resolved in release 1.30.0 (2022-03-20)

> Support Snapshot in RelMdColumnOrigins
> --------------------------------------
>
>                 Key: CALCITE-4977
>                 URL: https://issues.apache.org/jira/browse/CALCITE-4977
>             Project: Calcite
>          Issue Type: Improvement
>          Components: core
>    Affects Versions: 1.29.0
>            Reporter: Q Kang
>            Priority: Minor
>              Labels: pull-request-available
>             Fix For: 1.30.0
>
>          Time Spent: 40m
>  Remaining Estimate: 0h
>
> Currently `RelMdColumnOrigins` does not define a specialized method for `Snapshot` node. Thus, a request for origin column on a temporal query will always return NULL.
> For example:
> {code:java}
> select productid from products_temporal
> for system_time as of timestamp '2011-01-02 00:00:00' {code}
> The origin column of `productid` is NULL.
> We could simply propagate the call to its children like many other RelNode types do.



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